Standard themes in SCSS form, updated CompileDefaultTheme (#9223)
Conversion performed for most themes trivial, just rename file and wrap
in a mixin. For chameleon compounds, also nesting used. In some cases,
related small files combined in a single SCSS file
Chameleon accordion and select contain fixes other than just a missing
semicolon.
#7387 Render block elements in TreeTable hierarchy column correctly: draw the expand/collapse arrow as position: absolute and use padding for indentation. Also fix typo "ident" -> "indent".
#5780 TreeTable uses images that not display transparent in IE6 - reverted previous fix causing problems with safari 4. Added new fix using gif-versions of the arrows in IE6